Description:
------------
i'm using preg_replace() with the /e modifier to force php code to be run at the replacement.

preg_replace() and /e won't work if, instead of a regular function, i use a class object.

Reproduce code:
---------------
code shown in http://www.php.net/preg_replace
<?php
preg_replace("/(<\/?)(\w+)([^>]*>)/e", 
             "'\\1' . strtoupper('\\2') . '\\3'", 
             $html_body);
?>

my code:
<?php
 $someclass = new someclass();
preg_replace("/(<\/?)(\w+)([^>]*>)/e", 
             "'\\1' . $someclass->somefunction('\\2') . '\\3'", 
             $html_body);
?>

Expected result:
----------------
preg_replace ignores $someclass->somefunction() and just returns the text.